From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Diagram showing the experimental practice for wide base rim contours for passenger car tyres.
| Identifier | ExFiles\Box 156\3\ scan0249 | |
| Date | 25th October 1940 | |
| WIDE BASE RIM CONTOURS FOR PASSENGER CAR TYRES EXPERIMENTAL PRACTICE. 7-M 7" ± .063" 2.707 MAX. .022" MIN. 2° 1.125 MIN. .156"R MIN. 1.250 MIN. 13.483 DIA MAX. .555" MIN. .031"R MIN. 2° .380" .470" .300"R .520"R .930" +.047" -.016" 15.968 +.015" -.016" DIA 1.125 MIN. 20°±5° .375R 1.250 MIN 5°±1° 5°±1° 20°±5° .375R .750R .250R .250" +.031" .618" / .633" DIA. 2.500 DIAMETERS SHOWN ARE FOR 16" RIMS. APPROVED OCT. 25-1940. TR{Capt. F. W. Turner - Finance}-10-30-40M. | ||